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<h1 className="inline-block whitespace-no-wrap text-grey tracking-wide"> Hi, I'm 2997ms 👋
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<p>👷 I work as a <button id="divWorkButton" onclick="doWorkHide();" class="text-black font-bold bg-green-500 px-1">software engineer</button> on a daily basis.</p>
<div id="divWork" style="display:none;">
<table><tr>
<td align="center">
<img src="/images/amazon.png" height="100px" width="230px">
Amazon<br />
<small>Jun 2020 - Current</small><br/>
Software Engineer<br/>
</td>
<td align="center">
<img src="/images/airbnb.png" height="100px" width="230px">
Airbnb<br />
<small>Apr 2018 - Jul 2020</small><br/>
Full-Stack Engineer<br/>
</td>
<td align="center">
<img src="/images/startup.jpeg" height="100px" width="230px">
Startup Company<br />
<small>Jan 2018 - Feb 2018</small><br/>
Content Creator<br/>
</td>
</tr></table>
<p>👾 Internship experience:</p>
<table><tr>
<td align="center">
<img src="/images/byteDance.png" height="100px" width="230px">
ByteDance<br />
<small>Oct 2017 - Dec 2017</small><br/>
Software Engineer Intern<br/>
</td>
<td align="center">
<img src="/images/google.png" height="100px" width="230px">
Google<br />
<small>Jul 2017 - Sep 2017</small><br/>
Software Engineer Intern<br/>
</td>
<td align="center">
<img src="/images/byteDance.png" height="100px" width="230px">
ByteDance<br />
<small>Feb 2017 - May 2017</small><br/>
Software Engineer Intern<br/>
</td>
</tr></table>
</div>
<p>😄 I'm also passionate about smart contracts and solidity auditing. (Code4rena account: <a href = "https://code4rena.com/@2997ms">2997ms</a>, Sherlock account: <a href = "https://audits.sherlock.xyz/watson/2997ms">2997ms</a>) , feel free to check out
<button><a target="_blank" rel="noopener" href="https://github.com/2997ms">my github</a></button> and
<button><a href="https://2997ms.github.io/categories/BiWeeklyUpdate/">my progress report</a></button>. I have now become a content creator as well, uploading my lectures on smart contracts to <a href = "https://space.bilibili.com/20074880">Bilibili.</a></p>
<p>👨💻 Additionally, I love <button id="divRatingButton" onclick="doRatingHide();" class="text-black font-bold bg-green-500 px-1">competitive programming</button> very much.</p>
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<a target="_blank" rel="noopener" href="https://leetcode.cn/u/2997ms/">Leetcode Rating 2400+, Solved 3000+ problems</a>
<img src="/images/leetcode_rank.png" >
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<a target="_blank" rel="noopener" href="http://codeforces.com/profile/OrangeDream" >Codeforces Rating 2000+, Solved 967 problems</a>
<img src="/images/codeforces_rank.png">
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</tr></table>
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<a target="_blank" rel="noopener" href="https://www.codechef.com/users/wangchong756" >Codechef Rating 2000+</a>
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<a target="_blank" rel="noopener" href="https://www.hackerrank.com/2997ms" >Hackerrank Rating 2100+</a>
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<a target="_blank" rel="noopener" href="http://poj.org/userstatus?user_id=wangchong756" >Solved 850+ problems in POJ</a>
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<a target="_blank" rel="noopener" href="http://acm.hdu.edu.cn/userstatus.php?user=wangchong756" >Solved 200+ problems in HDU</a>
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<a target="_blank" rel="noopener" href="http://www.51nod.com/User/Index.html#userId=5374" >Rank 39 in 51nod</a>
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<a target="_blank" rel="noopener" href="https://projecteuler.net/progress=2997ms" >Level 3, solved 77 problems in ProjectEuler</a>
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<p>🌎 While I was in <button id="divUniveristyButton" onclick="doUniversityHide();">university</button>, I used to maintain a monthly life summary on <a target="_blank" rel="noopener" href="http://blog.csdn.net/u010885899">CSDN blog (written in Chinese)</a> and <a href="https://2997ms.github.io/categories/Chinese/">my own website (in Chinese).</a> Unfortunately, they are now deprecated. </p>
<div id="divUniversity" style="display:none;">
<h1 style="color:gray">Education:</h1>
<li>Beijing University of Posts and Telecommunications (Aug 2011 - Jun 2015), Computer Science Bachelor's Degree</li>
<li>Beijing University of Posts and Telecommunications (Sep 2015 - Jun 2018), Information Security Master's Degree</li>
<h1 style="color:gray">Publications:</h1>
<li><a target="_blank" rel="noopener" href="https://link.springer.com/chapter/10.1007/978-3-319-69811-3_39">
A Malware Detection Method Based on Sandbox, Binary Instrumentation and Multidimensional Feature Extraction (Chong Wang, Jianwei Ding, Tao Guo, Baojiang Cui)</a></li>
<li><a target="_blank" rel="noopener" href="https://link.springer.com/chapter/10.1007/978-3-319-49106-6_2">
A program behavior recognition algorithm based on assembly instruction sequence similarity (Baojiang Cui, Chong Wang, GuoWei Dong, JinXin Ma)</a></li>
</div>
<h4 style="color:gray">🦸♂️ Contact me: wangchong756@gmail.com </h4>
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<a href="/2023/05/31/EVM_Puzzles/EVM-Puzzle-2/" class="post-title-link" itemprop="url">EVM Puzzle 2</a>
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<time title="Created: 2023-05-31 19:40:19 / Modified: 19:42:20" itemprop="dateCreated datePublished" datetime="2023-05-31T19:40:19+01:00">2023-05-31</time>
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<p>Puzzle 2 is very similar to <a href="https://2997ms.github.io/2023/05/30/EVM_Puzzles/EVM-Puzzle-1/">Puzzle 1</a>, with the only difference being that this time we need to understand the CALLVALUE opcode. </p>
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<p>I recently discovered that the EVM Puzzle series is an excellent set of challenges to test our understanding of EVM opcodes. The puzzles can be found at this link: <a target="_blank" rel="noopener" href="https://github.com/fvictorio/evm-puzzles">https://github.com/fvictorio/evm-puzzles</a>. In this blog post, we will focus on solving the first puzzle.</p>
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<p>The gist of this question is that the “Recovery” contract created a “SimpleToken” contract but lost the address of the SimpleToken contract. Now, the goal is to find the address of the SimpleToken contract and transfer the ETH inside it. </p>
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<p>This question has a difficulty rating of 4 stars and is a very interesting one.</p>
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<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">it('Exploit', async function () {</span><br><span class="line"> /** CODE YOUR EXPLOIT HERE */</span><br><span class="line"> await this.token.transfer(this.pool.address, 1);</span><br><span class="line">});</span><br></pre></td></tr></table></figure>
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<p>In ERC20, there is not only <code>transfer</code> function, but also <code>transferfrom</code> function.</p>
<p>In this question, even if the <code>transfer</code> function is overridden and there is a <code>lockTokens</code> modifier to prevent transfers, the <code>transferFrom</code> function in ERC20 is not overridden. We can utilize this function to perform transfers.</p>
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<p>This question requires calculating an XOR value. To get the XOR value, we need to perform XOR operation again. The way the XOR value was originally calculated in the problem statement is the same logic that needs to be implemented in our smart contract code to get the XOR value.</p>
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